Stop chuck



Nov. 21, 1933. v A. G. LUNDIN 1,935,645

STOP CHUCK Filed Jan. 30. 1933 FIG. I

55 26 F 2 7 2 36 21 \jg 2% 1 J3 a1 [j 5 f4 15 -16 l VEN OR ATTORNEYPatented Nov. 21, 1933 1 Tarps PATENT CE 7' 1,935,645 Y 1 STOP CHUCKAxel -G. Lundin, Blairstown, N. J., assignor to American Machine &Foundry Company, a corporation of New Jersey Application January 3ll,

2 Claims.

This invention relates to an improved chuck of the type in which thetool is automatically locked at any position in the chuck, its .mainobject being theproduction of a chuck having 5 novel locking means. Withthis and otherobjects not specifically mentioned in view, the inventionconsists in certain constructions and combinations hereinafter fullydescribed and then specifically set forthin the claims hereuntoappended.

In the accompanying drawing which forms a part of this specification,and in which like char-' acters of reference indicate the same or likeparts, J Fig. 1 is a. sectional side elevation of the stop chuck; it VFig. 2 is a top view taken on the line 22 of Fig. 1 with the drivingshank removed, showing the lock ring in its closed position; and Fig. 3is a similar view showing the lock ring in its open position.

In carrying the invention into effect there is provided, in combination,tool gripping jaws,

means for closing the jaws to grip'a tool inserted 25 therebetween, androtating them with the gripped tool, a stop pin yieldingly mounted insaid means and arranged to engage the inner end surface of the tooltoprevent inward movement of the tool while it is gripped by said jaws,and devices for locking said pin in any position to which it may bepushed while inserting the tool between said jaws. In the best forms ofconstruction contemplated said devices include a circumferentiallyinterrupted threaded portion on said pin,

35, and a lock wheel having a hub rotatably mounted in said means andprovided with a circumferentially interrupted threaded portion adaptedto engage the threaded portion of the pin. These various means and partsmay be widely varied in construction within the scope of the claims, forthe particular device selected to illustrate the invention is but one ofmany possible concrete embodiments of the same. The invention,therefore, is not be restricted to the specific construction shown anddescribed.

Referring to the drawing, the shank is attached tothe upper end of thebody 11 by screws and the grip ring 12 is also secured to the body by'screws (see Fig. 1). The body 11 carries a hollow spindle 14 havingexternal threads engaging with the threaded portion of the shell 13which is supported by grip ring 12 and'free to ,turn thereon. Thespindle 14 has a key 15 which is slidably mounted in a keyway 16 ofbody'11. 55 A plug 17 which is fitted into the lower end of 1933.SerialNo. 654,355 (01. 279-9) the spindle 14 engages the tool grippingjaws 18' mounted in the tapered socket of the shell and yieldingly heldapart by interposed springs.

A look wheel 19 surrounding the shank 10 has a hub 20 which is turnablymounted in an internal recess in the upper end of the bore of the body11. A portion of the inner periphery of hub 20 has a fluted threadedsection 21, engaging with fluted threaded sections 22 of lock pin 23.The tip 24 of the lock pin 23 is guided in a circular'opening 25 in thelower end of the spindle 14. A compression spring 26 is seated in thelongitudinal bore in lock pin 23, its other end bearing against the"base of aperture 27 provided in the shank 10, thus yieldingly pressingshouldered tip 24 against the-base of the spindle 14 when the lock wheel19 is in its open position as shown in Fig. 3.

The lock wheel 19 (Figs. 2 and 3), has a number of spokes 28, spaced inreference to the stop lugs 29, on the body 11. Spokes 28 and lugs 29 arespaced in relation to each other and the threaded sections of the hub 20and lock'pin 23 respectively for a purpose hereinafter described.Longitudinal slots 30 are provided between the threaded portions 21 ofhub 20, and similar slots 31 are provided between the threaded sectionsof lock pin, 23. When the lock wheel is in its open position (Fig. 3),the sections 22 of lock pin 23 are opposite the slots 30 of hub 20, andthe sections 21 of the hub 20 are opposite the slots 31 of lock pin 23.The lock pin 23 can now be pushed upward, thus permitting the tool 32 tobe set at a desired point.

The operation of the chuck is as follows:

When the lock wheel is in open position the tool 32 is pushed againstthe lock pin 23 thus 32 having been correctly set, the lock wheel 19- isturned (see Fig. 2), and the threaded sections .21 encounter andinterlock with the threaded sec tions 22, thus the lock pin 23 issecurely heldat its desired setting. The turning of wheel 19 permits aspring-pressed vball 35 carried by the shank 10 to snap into engagementwith a depression 36 provided in the wheel 19, thus locking the wheel inits closed position. The shell 13 is held by the operator while rotationof the driving shank 10 turns the spindle'14 and causes the relativelystationary threaded portion of the shell TOT 13 to force the rotatingspindle 14 downward along the keyway 16 of body 11. Thereupon thepressure applied to the plug 17 forces the jaws 18 downwardly in thetapered socket of the shell 13, thereby causing them to grip the tool.32 and shell, and rotate the same.

While the lock wheel might be turned manually to its closed or openpositions, this result is preferably obtained automatically in thefollowing manner. When the driving shank is rotated in a clockwisedirection, as indicated in Fig. 3, the stop lugs 29 on body 11 are movedinto engagement with the spokes 28 of the lock wheel, thereby turningthe latter until the circumferentially interrupted threaded portionsonthe interior of its hub encounter the circumferentially interruptedthreaded portions one thestop pin 23, whereupon the spring-pressed ball35 on the driving shank snaps into the depression 36 in the wheel andlocks the latter in its closed position. At the same time the operatorgrasps the shell 13 to hold it stationary relative" to the rotatingspindle 14 so that the interfitting threaded portions of these'memberswill causethe spindle tomove downwardly and push theplug 17 down againstthe tool gripping jaws to bring them inio gripping relation with thetool and'the interior of the socket in the lower. end of the shell: Theoperator now releases the shell, and thegripped tool is fed into theworld. Y Y

To remove the tool from the chuck the driving shank 10 is rotated in acounter-clockwise -direction, as indicated in Fig; 2, and the shell 13is grasped manually to hold itstationary relative to the spindlevl4 sothat the interfitting threaded portions of these two: members will causethe spin of engagement with threaded portions of the stop pin 23,thereby permitting the spring 26 to seat the stop pin on the spindle 14.

What is claimed is: I

1. In a chuck, the combination with tool gripping jaws, of means forclosing the jaws to grip a. tool inserted therebetween and rotating themwith the gripped tool, a stop pin yieldingly mounted in said means andarranged to engage the inner end surface of the tool to prevent inwardmovement of the, tool while it is gripped by said jaws, and devices forlocking said pin in any position to which it may be pushed whileinserting the tool between said jaws, said devices including acircumferentially interrupted threaded portion on said. pin, and a lockwheel having a hub rotatably mounted in said means and provided withacir'cumferential1y interrupted threaded portion adapted to engage thethreaded portion of the 2. Ina chuck, the combination with a drivingshank, ofla hollow body attached to said shank, a hollow spindlesurrounding said body and splined thereto, a grip ring secured to saidbody, a shell supported from said ring and free to turn thereon, saidshell being provided with a socket in-its lower end, tool gripping jawsmounted in said socket, a lock wheel having a hub turnably mounted insaid body, a spring-pressed stop pin bearing against the lower end ofsaid spindle, said pin and hub having circumferentiallyinterruptedthreaded portions adapted to be engaged when said wheel isturned into the proper position to lock said pin against axial movement,and said shell and spindle having interfitting threaded portions,whereby the rotaiion of said shank while said shul is manually heldstationary will cause the spindle to push said jaws into grippingrelation with a. tool inserted therebetween and said shell. r

AXEL G. LUNDIN.

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